﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
namespace Common
{
   public class PagerHelper
    {
        /// <summary>  
        /// DataTable分页  
        /// </summary>  
        /// <param name="dt">DataTable</param>  
        /// <param name="PageIndex">页索引,注意：从1开始</param>  
        /// <param name="PageSize">每页大小</param>  
        /// <returns>分好页的DataTable数据</returns>              第1页        每页10条  
        public DataTable GetPagedTable(DataTable dt, int PageIndex, int PageSize)
        {
            if (PageIndex == 0) { return dt; }
            DataTable newdt = dt.Copy();
            newdt.Clear();
            int rowbegin = (PageIndex - 1) * PageSize;
            int rowend = PageIndex * PageSize;

            if (rowbegin >= dt.Rows.Count)
            { return newdt; }

            if (rowend > dt.Rows.Count)
            { rowend = dt.Rows.Count; }
            for (int i = rowbegin; i <= rowend - 1; i++)
            {
                DataRow newdr = newdt.NewRow();
                DataRow dr = dt.Rows[i];
                foreach (DataColumn column in dt.Columns)
                {
                    newdr[column.ColumnName] = dr[column.ColumnName];
                }
                newdt.Rows.Add(newdr);
            }
            return newdt;
        }  
    }
}
